Exodus 10:21 – 29
And the Lord said to Moses, Let your hand be stretched out to heaven, and all the land of Egypt will be dark, so that men will be feeling their way about in the dark. And when Moses' hand was stretched out, dark night came over all the land of Egypt for three days; They were not able to see one another, and no one got up from his place for three days: but where the children of Israel were living it was light. Then Pharaoh sent for Moses, and said, Go and give worship to the Lord; only let your flocks and your herds be kept here: your little ones may go with you. But Moses said, you will have to let us take burned offerings to put before the Lord our God. So our cattle will have to go with us, not one may be kept back; for they are needed for the worship of the Lord our God; we have no knowledge what offering we have to give till we come to the place. But the Lord made Pharaoh's heart hard, and he would not let them go. And Pharaoh said to him, Go away from me, take care that you come not again before me; for the day when you see my face again will be your last. And Moses said, you say truly; I will not see your face again.